Empirical Formula
a chemical formula of a compound that gives the proportions of the elements present in the compound
What is the empirical formula?
It tells us the actual numbers of atoms and how many of each type of atom are present in a molecule.
Molecular Formula
Percent composition of oxygen in CO2
What is 72.7%?
Determine the empirical formula for a the unknown compound that has 66.4% Cu, 33.6% S
CuS
11.25% C, 88.75% Cℓ; mol. wt. = 320
C3Cℓ8
Percent composition of nitrogen in NH3
What is 82.4%?
Find the empirical formula of a compound containing 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen.
CH2O
TRUE OR FALSE
An empirical formula is always the same as the molecular formula?
FALSE! A molecular formula is either the empirical formula or a multiple of the empirical formula.
Percent composition of Na in NaNO₂
What is 33.33%?
Determine the empirical formulas for an unknown compound that has 0.366 g Na, 0.220 g N, 0.752 g O
NaNO3
65.45% C, 5.45% H, 29.10% O; mol. wt. = 110
C6H6O2
Percent Composition of CO3 in H2CO3
What is 96.75%?
What is the empirical formula of a compound containing 60.0% sulfur and 40.0% oxygen by mass?
S3O4
Caffeine has the following composition: 49.48% of carbon, 5.19% of hydrogen, 16.48% of oxygen, and 28.85% of nitrogen. The molecular weight is 194.19 g/mol. Find out the molecular and empirical formula.
C4H5N2O.
Percent Composition of NO3 in Mg(NO3)2
What is 83.53%?